The Cypherdex is the original Tome that that all others are based upon.

A key piece of equipment for Casterwill Seekers, it is controlled by voice commands and is capable of displaying 3-D holographic images of Titans, their abilities, powers, and is able to map local areas. It is also capable of communication with other Tomes, scanning objects and storing information. The Cypherdex is bright electric blue with an orange screen, and it produces holograms using orange light. The Casterwill family can summon their Cypherdexes by using the Cyphercall spell.